User's Manual l MBa8Xx UM 0100 l © 2020, TQ-Systems GmbH
Page 36
3.8.10
USB Hub
Two USB 3.0 host interfaces are provided on X20 (Top: USB Host 3; Bottom: USB Host 4). The maximum output current of each
Host is 900 mA. Since the TQMa8Xx only provides two USB interfaces and one of them is used as a debug interface on the
MBa8Xx, the second USB interface of the TQMa8Xx is connected to a hub, which provides two additional, internally used USB 2.0
hosts in addition to the two USB 3.0 hosts described here. Further details can be found in chapter 3.7.
The USB 3.0 OTG port of the TQMa8Xx provides a theoretical data rate of 5 Gbps. This is divided among the connected ports of
the USB 3.0 hub. Depending on the software and hardware used, the effective read and write rates of the ports can vary.
TQMa8Xx
Mini PCIe
Slot (X24)
USB OTG2
TUSB8041
USB_Dx
USB_DN1
LVDS SVB
(X22)
USB_DN2
USB_DN3
USB 2.0
Stacked
USB
Type A
(X20)
USB 2.0
USB 2.0
USB 2.0 / 3.0
I2C
I2C1
Level-
Shifter
OTG2_VBUS
V_5V_USB
1
kΩ
1.87
kΩ
Switch
FPF2165R
V_5V_USB
V_VBUS_H3
PWRCTRL3
OVERCUR3#
USB_DN4
USB 2.0 / 3.0
Switch
FPF2165R
V_5V_USB
V_VBUS_H4
PWRCTRL4
OVERCUR4#
Switch
MIC2026
V_5V
V_USB_H2_VBUS
PWRCTRL3
OVERCUR3#
USB SS
USB SS
USB_SS
Figure 17: Block diagram USB Hub
Note: USB 3.0 on carrier board
When realizing an own carrier board with USB 3.0, it is mandatory to keep the architecture shown in
Figure 17, since the super speed signals cannot be used together with USB OTG1.
